🌱 Change AdoptPorts to not be Machine dependent

[EmilienM]

What this PR does / why we need it:

Allow to re-use AdoptPorts function without the Machine API.
This is useful work for the OpenStackServer effort where we need this
function but don't want to rely on the MachineResources.

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[EmilienM]

This will fail in tests, I'm not sure why yet.

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[k8s-ci-robot]

@EmilienM: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-openstack-test	3979e1e	link	true	/test pull-cluster-api-provider-openstack-test
pull-cluster-api-provider-openstack-e2e-test	3979e1e	link	true	/test pull-cluster-api-provider-openstack-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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